UBUNTU-CVE-2026-59845

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Source
https://ubuntu.com/security/CVE-2026-59845
Import Source
https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-59845.json
JSON Data
https://api.osv.dev/v1/vulns/UBUNTU-CVE-2026-59845
Upstream
  • CVE-2026-59845
Downstream
Related
Published
2026-07-21T12:18:00Z
Modified
2026-08-31T17:16:50Z
Severity
  • 5.3 (Medium) CVSS_V3 - CVSS:3.1/AV:L/AC:H/PR:L/UI:R/S:C/C:N/I:N/A:H CVSS Calculator
  • 5.9 (Medium) CVSS_V3 - CVSS:3.1/AV:L/AC:L/PR:L/UI:R/S:C/C:N/I:N/A:H CVSS Calculator
  • Ubuntu - medium
Summary
[none]
Details

A flaw was found in libssh. When ProxyCommand is used, an unchecked fork() failure can be stored as process ID -1; during cleanup, signals may then be sent across the caller's accessible process tree, leading to local denial of service.

References

Affected packages

Ubuntu:22.04:LTS
libssh

Package

Name
libssh
Purl
pkg:deb/ubuntu/libssh?arch=source&distro=jammy

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0 Unknown introduced version / All previous versions are affected
Fixed
0.9.6-2ubuntu0.22.04.8

Affected versions

0.*
0.9.6-1
0.9.6-1build1
0.9.6-2
0.9.6-2build1
0.9.6-2ubuntu0.22.04.1
0.9.6-2ubuntu0.22.04.2
0.9.6-2ubuntu0.22.04.3
0.9.6-2ubuntu0.22.04.4
0.9.6-2ubuntu0.22.04.5
0.9.6-2ubuntu0.22.04.6
0.9.6-2ubuntu0.22.04.7

Ecosystem specific 

{
    "availability": "No subscription required",
    "binaries": [
        {
            "binary_name": "libssh-4",
            "binary_version": "0.9.6-2ubuntu0.22.04.8"
        },
        {
            "binary_name": "libssh-gcrypt-4",
            "binary_version": "0.9.6-2ubuntu0.22.04.8"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-59845.json"
Ubuntu:24.04:LTS
libssh

Package

Name
libssh
Purl
pkg:deb/ubuntu/libssh?arch=source&distro=noble

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0 Unknown introduced version / All previous versions are affected
Fixed
0.10.6-2ubuntu0.5

Affected versions

0.*
0.10.5-3ubuntu1
0.10.5-3ubuntu2
0.10.6-2
0.10.6-2build1
0.10.6-2build2
0.10.6-2ubuntu0.1
0.10.6-2ubuntu0.2
0.10.6-2ubuntu0.3
0.10.6-2ubuntu0.4

Ecosystem specific 

{
    "availability": "No subscription required",
    "binaries": [
        {
            "binary_name": "libssh-4",
            "binary_version": "0.10.6-2ubuntu0.5"
        },
        {
            "binary_name": "libssh-gcrypt-4",
            "binary_version": "0.10.6-2ubuntu0.5"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-59845.json"
Ubuntu:26.04:LTS
libssh

Package

Name
libssh
Purl
pkg:deb/ubuntu/libssh?arch=source&distro=resolute

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0 Unknown introduced version / All previous versions are affected
Fixed
0.11.3-1ubuntu2.1

Affected versions

0.*
0.11.2-1build1
0.11.3-1
0.11.3-1ubuntu1
0.11.3-1ubuntu2

Ecosystem specific 

{
    "availability": "No subscription required",
    "binaries": [
        {
            "binary_name": "libssh-4",
            "binary_version": "0.11.3-1ubuntu2.1"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-59845.json"
Ubuntu:Pro:16.04:LTS
libssh

Package

Name
libssh
Purl
pkg:deb/ubuntu/libssh?arch=source&distro=esm-infra%2Fxenial

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0 Unknown introduced version / All previous versions are affected

Affected versions

0.*
0.6.3-3ubuntu3
0.6.3-4.1
0.6.3-4.2
0.6.3-4.2ubuntu1
0.6.3-4.3
0.6.3-4.3ubuntu0.1
0.6.3-4.3ubuntu0.2
0.6.3-4.3ubuntu0.5
0.6.3-4.3ubuntu0.6
0.6.3-4.3ubuntu0.6+esm1
0.6.3-4.3ubuntu0.6+esm2
0.6.3-4.3ubuntu0.6+esm3
0.6.3-4.3ubuntu0.6+esm4
0.6.3-4.3ubuntu0.6+esm5

Ecosystem specific 

{
    "binaries": [
        {
            "binary_name": "libssh-4",
            "binary_version": "0.6.3-4.3ubuntu0.6+esm5"
        },
        {
            "binary_name": "libssh-gcrypt-4",
            "binary_version": "0.6.3-4.3ubuntu0.6+esm5"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-59845.json"
Ubuntu:Pro:18.04:LTS
libssh

Package

Name
libssh
Purl
pkg:deb/ubuntu/libssh?arch=source&distro=esm-infra%2Fbionic

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0 Unknown introduced version / All previous versions are affected

Affected versions

0.*
0.7.5-1
0.8.0~20170825.94fa1e38-1
0.8.0~20170825.94fa1e38-1build1
0.8.0~20170825.94fa1e38-1ubuntu0.1
0.8.0~20170825.94fa1e38-1ubuntu0.2
0.8.0~20170825.94fa1e38-1ubuntu0.5
0.8.0~20170825.94fa1e38-1ubuntu0.6
0.8.0~20170825.94fa1e38-1ubuntu0.7
0.8.0~20170825.94fa1e38-1ubuntu0.7+esm3
0.8.0~20170825.94fa1e38-1ubuntu0.7+esm4
0.8.0~20170825.94fa1e38-1ubuntu0.7+esm5
0.8.0~20170825.94fa1e38-1ubuntu0.7+esm6
0.8.0~20170825.94fa1e38-1ubuntu0.7+esm7

Ecosystem specific 

{
    "binaries": [
        {
            "binary_name": "libssh-4",
            "binary_version": "0.8.0~20170825.94fa1e38-1ubuntu0.7+esm7"
        },
        {
            "binary_name": "libssh-gcrypt-4",
            "binary_version": "0.8.0~20170825.94fa1e38-1ubuntu0.7+esm7"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-59845.json"
Ubuntu:Pro:20.04:LTS
libssh

Package

Name
libssh
Purl
pkg:deb/ubuntu/libssh?arch=source&distro=esm-infra%2Ffocal

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0 Unknown introduced version / All previous versions are affected

Affected versions

0.*
0.9.0-1ubuntu1
0.9.0-1ubuntu4
0.9.0-1ubuntu5
0.9.3-2ubuntu1
0.9.3-2ubuntu2
0.9.3-2ubuntu2.1
0.9.3-2ubuntu2.2
0.9.3-2ubuntu2.3
0.9.3-2ubuntu2.4
0.9.3-2ubuntu2.5
0.9.3-2ubuntu2.5+esm1
0.9.3-2ubuntu2.5+esm2
0.9.3-2ubuntu2.5+esm3
0.9.3-2ubuntu2.5+esm4

Ecosystem specific 

{
    "binaries": [
        {
            "binary_name": "libssh-4",
            "binary_version": "0.9.3-2ubuntu2.5+esm4"
        },
        {
            "binary_name": "libssh-gcrypt-4",
            "binary_version": "0.9.3-2ubuntu2.5+esm4"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-59845.json"